Improvement in paper-cutting machines



2 Sheets--Sheet1.

GEORGE A. WALKER.

Paper Cutting Machine. No.124,774. Patented March19,18 72.

2 Sheets--Sheet 2.

GEORGE AQWALKER.

Paper Cutting Machine. N0. 124,774. Patented March19,1872. I

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GEORGE A. WALKER, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN PAPER-CUTTING MACHINES.

Specification forming part of Letters Patent No. 124,774, dated March19, 1872.

a, in connection with the drawing which accompanies and forms part ofthis specification, is

a description of my invention sufficient to enable those skilled in theart to practice it.

My invention relates to certain details of construction of machines forcutting paper, the improvements having reference to the method ofactuating the knife and to the method of adjusting the gauge-bar,against which rest the edges of the paper opposite to the edges to betrimmed.

The drawing represents a machine embodying the improvements.

A shows the machine in side elevation. B is a plan of it. C is a centralvertical section. D is a bottom view of the table. E is a verticalsection of the cutter bar, cutter, and clamp.

a denotes the frame; I) b, the upper ends of the uprights, in thevertical slots 0 of which the cutter-bar 01 moves laterally andvertically, said bar being suspended by links 6 from the head f, andhaving in one end an oblong vertical slot, 9, in which moves theactuatingcam h that drives the cutter-bar forward, and thereby impartsthe cutting motion to the knife 6. This cam is fast upon adriving-shaft, It, on which is the crank or hand-wheel Z, the shaftturningin a stationary bearing, and. as the cam rotates and drives thecutter-bar forward the downward movement of the cutter-bar is controlledby the links 0 and a hold-back and lifter-roll, m, hung upon a pin, at,extending from the cam. The periphery of this roll runs against the edgeof a track-plate, 0, extending from the slotted end of the knife-bar,and the rise and outward movement of the bar is'effected by the rollwhich runs on the edge of the plate, and thereby prevents wear andstrain upon the face of the cam, and facilitates and eases the rise ofthe bar, the friction being overcome by the rotation of the roll. Aneccentric may be substituted for the cam and roll, but, in somerespects, the cam and roll are preferable. In either case the cutter-barcan move down. only so fast as permitted by the links, while the slotpermits the free vertical. movement of the bar, and the cam or eccentricimparts the positive lateral cutting movement. The cutter is confined tothe cutter-bar by screws p passing through slots q in the bar, and thehead of the cutter-bar projects over the top of the knife or cutter, andhas set-screws r passing through the overhanging portion.

By loosening the screws p the cuttingedge along its whole length may bebrought down to the surface of the bed j when the bar is in its lowestposition, the set-screws 0 being then turned down until they strike thetop of the cutter. The screws p are then turned up, and the cutter isthereby fastened in position. As the cutting edge wears and is reducedby sharpening the set screws are turned down in accordance with thedecreased width of the cutter, and thus the cutter is kept in correctposition. v

On the back side of the cutter-bar is a clampbar, 8, by which the paperis pressed down to the table, and compacted and held firmly in positionfor the stroke of the cutter. To prevent buckling of the cutter, and toact as a gauge or guide against which it shall rest lat= erally, thefront edge of the bar 8 is brought up to the cutting-plane. To keep thisplane true I make the bar with a shoe, t, formed of wood, and confinedto the bottom of the bar by screws a passing through slots 0. The edgeof this bar is kept up to the face of the cutter, projecting for thispurpose slightly beyond the face of the bar above it. As the edge of theshoe wears it is fed forward by loosening the screws to, the bar beingscrewed down so as to be below the cutting-edge of the knife, and thescrews being then tightened the I knife descends and trims and trues offthe edge of the shoe, which then forms a new bearing-surface and guagefor the back of the knife.

w denotes the sliding gauge that rests against the rear edges of thepile of paper, its front face forming the surface parallel to which theknife is to cut. This gauge has atail-piece, w, fixed to a slide, y,travelingin a guide-groove, z, the screw-threaded shank a? of afeed-screw working in a nut-thread formed in a projection from theslide, to enable the bar to be fed up toward or from the cutter.

To keep the face of the bar in correct position it is made adjustable asfollows A screw, b passes through ahole of corresponding size inthetail-piece 00 into the slide y. Another screw, 0 passes through aslot, LP, in the tailpiece, into the slide y. Near the end of thetail-piece is a slot or square hole, 0 through which a verticalprojection, f passes from the slide, the projection being smaller thanthe slot or hole, andleaving play for the tail-piece. Set-screws 9 passthrough the tail-piece and abut against the projection, and, byloosening the screw 0 the tail-piece, and consequently the bar, may beslightly turned, by screwing back one set-screw and starting forward theother, until the face of the bar is brought to accurate position. Thescrew 0 is then turned down, and the bar will be thereby secured incorrect position.

The front and narrow part j of the table is made stationary with respectto the frame, but the rear and wide part 2' that receives the paper isformed as a leaf hinged to the part j, as

seen at O, and is supported in horizontal position by a prop, l hingedat top, as seen at W, and resting at bottom on the stretcher 12 Byturning forward the feed-screw a until the slidey is fed from the screwand lifting the prop, the leaf may be dropped into a vertical position.

I claim- 1. In combination with the cam h working in the oblong slot 9of the cutter-bar, I claim the loose roll m mounted on the face of saidcam and eccentric thereto, and operating in conjunction with thestraight-edge of the rolltrack 0, substantially as shown and described.

2. The edge-gauge w, made adjust-able angularly, or with respect to tothe path of movement of the cutting-edge, by means of the two verticalscrews 1) c and slot d and the two horizontal screws as described.

G. A. WALKER.

Witnesses:-

FRANCIS GOULD, S. B. KIDDER.

